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The correct syllable division of the word "traumatism" is trau-ma-tism, consisting of three syllables. The confusion arises from the vowel sequence "au," which forms a diphthong rather than being separated into two distinct vowels. Understanding the difference between diphthongs and hiatus is crucial for proper pronunciation. In this case, "au" is pronounced together in the same syllable, making the four-syllable division incorrect.